Boiler plant



March 10, 1931,. A. RUHR BOILER PLANT Filed April 21. 192'! I 2 Sheets-Sheet '1 2 Sheets-Sheet 2 IWVEA TOX A T 7' 0K IVE K! Patented Mar. 10, 1931 STATES PATENT OFFICE ARNOLD Efi'ER, OF BERLIN, GERMANY, ASSIGNOB TO INTERNATIONAL COMBUSTION ENGHEEEING GOEPOBATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE BOILER PLANT Application fled April 21, 1927, Serial No. 185,559}, and in Germany April 22, 1926.

This invention relates toimprovements in boiler plants and is especially useful in plants burning fuel in space, as, for example, pulverized coal.

One of the primary objects of the invention is to provide for improved circulation and distribution, especially where the combastion space is largely defined by tubes subject to radiant heat.

Another object of the invention vide an improved arrangement of boiler parts whereby it is possible to provide an effective combustion space largely formed by tubes subject to radiant heat to which heat is efiectively transmitted, the remaining parts of the boiler being located outside of the combustion space proper whereby it is possible to make such portions of any desired size without interfering with the combustion of the fuel and Without detrimentally affecting the heat transmission to the radiant heat tubes.

A more specific object is to provide the specific combination and organization of parts hereinafter described.

More specific objects of the invention will a ear hereinafter.

How the foregoing, together with such other objects and advantages as may hereinafter a pear, or are incident to my invention, are rea ized, is illustrated in preferred form in the accompanying drawing, wherein Fig. 1 is a sectional elevation of a boiler plant embodying the invention,

Fig. 2 is a sectional front elevation taken on line TI -ll and II -II' of Fig. 1.

Referring now to the drawings, the reference character A denotes the combustion chamber of the furnace as a whole, and B denotes the boiler as a whole.

Fuel is referably admitted in the upper portion a? meansof burners l. Combustion air is supplied partly by means of the burners 1 thus securing prompt ignition of the fuel stream entering the combustion chamber and partly as secondary air. This secondary air is sup plied through hollow compartment 2 and openings 3 1n the furnace front wall such openings being distributed over the whole is to prothe combustion chamber A by' front wall extension so that horizontal secondary air streams are introduced at different levels. the flame takes a U-shaped path within the combustion chamber. The gases leaving the combustion chamber are divided into two sides of the combustion chamber. Preheated.

air is preferably used as secondary combustion air and for this purpose is supplied to Because of the boiler flue draft the compartments 2 in the furnace front wall by means of air boxes 10.

The downwardly flowing flame streams are surrounded by refractory walls in order to secure prompt ignition and complete combustion of the fuel; the upwardly flowing flame streams, however, are surrounded by heat absorbing boiler elements.

The side walls in their rear extension and the rear wall of the furnace are lined by boiler tubes. The boiler illustrated in the drawing comprises three upper drums 4 and two lower drums 5. The upper drums are arranged above the furnace chamber while the lower drums 5 are located along the side walls and outside of the furnace chamber. The lower drums 5 are connected with the middle upper drum by meansof banks of tubes 6 and with the outside upper drums by means of banks of tubes 6b. These banks are suitably bafied, for example as indicated at Go. The rear bank of tubes 66 constitute downcorners from the outside upper drums to the drums 5. The tubes of the banks of tubes 6 extend vertically upward from the drums 5 for a portion of their length and then curve inwardly for connection into the upper middle drumso that, in effect, the vertical portion of these banks constitute side walls of the furnace and the upper curved portions constitute a roof for the furnace. I i

The furnace rear wall is lined by a row of tubes which connect the upper drums with a lower header 7 located outside the rear wall of the furnace. The header '2' is connected with a header 9 located adjacent the front wallby means of tubes 8 forming a bottom cooling screen of the furnace chamber. The header 9 may be connected with the lower or upper boiler drums for water feeding purposes as, for example, by downcomer means such as indicated at 9a in Fig. 1.

The tubes lining the rear furnace wall are curved at their upper portions for connection into the upper drums so that they are equally spaced along the rear wall.

From the drawing it will be seen that because of the special arrangement of the boiler 1 tubes the radiant heat of the flame is transmitted directly to the boiler heating surface as much as possible. Thus I greatly increase the steaming capacity of a boiler installation of a given size and, by reason of the fact that the walls of the furnace are lined with evaporating tubes, protection is afforded for the refractories of the walls, and, consequently, burning out the refractories is prevented. In fact, the only refractories exposed to the flame which I employ are located in the region of fuel introduction and serve to aid ignition. It will further be seen that special cooling screens in the furnace are avoided and compensated by organic boiler parts so that the 2 boiler system is uniform and complications in the water-circulation are avoided.

Claim: In a pulverized fuel burning boiler furnace, a combustion chamber, upright water tubes forming the rear wall thereof, a plurality of upper drums, a pair of lower drums, banks of boiler tubes connecting the lower and upper drums, said banks including bent tubes extending upright for a portion of their extent 3 to form side walls of the combustion chamber and extending inwardly at their upper portions to form a roof for the combustion chamber, a lower header into which the lower ends of the rear wall tubes are connected, certain of said rear wall tubes being connected at their upper ends into one of the upper drums and the remaining rear wall tubes being connected at their upper ends into the other upper drums, means for feeding water to the rear wall tubes, and means for admitting fuel into the combustion chamber.

In testimony whereof I affix my signature.

ARNQLD RUHR. 

